440 REV. O. P. CAMBRIDGE ON SIBERIAN SPIDERS. [May 6, 



that of the facial space ; it is strongly impressed immediately below 

 the eyes, and prominent at its lower margin. 



The eyes are in the ordinary position and not greatly unequal in 

 size. All are seated on tolerably strong tubercles ; those of the lateral 

 and fore central pairs being the strongest ; the eyes of the hinder row 

 are about equidistant from each other ; those of each lateral pair 

 are very nearly contiguous to each other, the fore laterals being the 

 largest of the eight. There is a slight interval (of less than half an 

 eye's diameter) between those of the fore central pair, which are 

 the smallest of the eight, though larger than in most species of 

 Linyphia. 



The legs are long, pretty strong ; their relative length appeared 

 to be 1, 4, 2, 3 ; and they are furnished with hairs and rather long 

 and strong spines. The palpi are, like the legs, of a clear bright 

 yellow colour, and furnished with hairs and spine-like bristles. 



The abdomen is oval, of about the ordinary convexity above, and 

 projects considerably over the base of the cephalothorax ; its ground- 

 colour is pale yellow, more or less covered with small, irregular, 

 white, cretaceous spots and markings ; and the following pattern in 

 black is also visible — a central longitudinal marking on the fore half 

 of the upperside, strongly hollowed or indented on the sides, and two 

 longitudinal rows of irregular spots, rather converging towards the 

 spinners ; the posterior pairs of these spots bear traces of being 

 (what no doubt they are) the dilated extremities of the ordinary 

 angular lines or chevrons with which the binder portion of the abdo- 

 men in so many spiders is marked ; in the present, as in many other 

 species, the apices of these angular lines are obsolete. The sides of 

 the abdomen are occupied by a long black patch, strongly dentated 

 on its upper margin, and its lower and hinder margin bouuded by a 

 broken whitish-yellow line or bar formed by that portion of the 

 ground-colour. The underside and a clear portion round the 

 spinners are of a uniform, somewhat vinous, yellow-brown. The 

 sexual aperture is prominent, and furnished with a longish, curved, 

 longitudinal process, which (looked at with the Spider on its back) 

 is considerably dilated at its hinder extremity. 



Two adult females and an immature male were contained in M. 

 Taczanowski's Siberian collection of Micro- aranese ; they seem to me 

 to be very distinct from any species yet known, and to be (in colour 

 and markings) nearly allied to Linyphia (Neriene, Bl.) variegata 

 (Bl.), but greatly exceeding that species in size. The future dis- 

 covery of the male in an adult state will probably show some strong 

 structural characters in the palpi and palpal organs by which to 

 differentiate that sex from the males of other nearly allied species. 



Genus Erigone {Neriene, BL, ad partem + Walckenaera, Bl.). 



Erigone (Neriene, Bl.) flavescens, sp. n. (Plate XL. fig. 6.) 



Adult male f of a line ; adult female slightly longer. 

 The whole of the fore part of this small Spider is of a pale but 

 clear and brightish yellow colour, the abdomen being paler and more 



